Should the 49ers feel good about themselves?

The 49ers committed 11 penalties for 99 yards yet went into half time with a 12-10 lead. They were able to keep Lions wide Calvin Johnson under wraps by using pretty conventional coverage with Tarell Brown on him and generally a safety over the top. Ndamukong Su has also been neutralized. The 49ers might want to mix up their coverage on tight end Brandon Pettigrew, who was guarded in man coverage by Patrick Willis in the red zone. Pettigrew scored Detroit’s only touchdown on 16-yard pass to Pettigrew with Willis covering. The 49ers have to watch out because the Lions out score their opponents by an average of 17 points in the second half.